Focusing of Reflected Shock Waves Analyzed by Means of Geometrical Shock Dynamics

  • Sakamoto Ichiro
    Traffic Nuisance Division, Traffic Safety and Nuisance Research Institute, Ministry of Transport
  • Higashino Fumio
    Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology
  • Holl Rolf
    Rheinmetall GmbH

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Description

In the present work, a numerical scheme for the unsteady motion of shock waves in gases is developed based on Whitham's theory of geometrical shock dynamics (GSD) . To investigate the effect of the initial shock strength on the shock reflection and diffraction on a wall, the two-dimensional focusing of cylindrical blast waves reflected from a concave elliptic wall is analyzed under various initial conditions. The results are compared with finite difference simulations based on the piecewise linear method (PLM) as well as with previous experimental results. It is found that geometrical shock dynamics is a practical and economical method to analyze the shock focusing process of the blast waves produced by exploding wires. Pressure changes along the major axis of the ellipse show good agreement when the present computations are compared with experimental results as well as with PLM simulations.

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Details 詳細情報について

  • CRID
    1570854177096500608
  • NII Article ID
    110002976693
  • NII Book ID
    AA10888815
  • ISSN
    13408054
  • Text Lang
    en
  • Data Source
    • CiNii Articles

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